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15 May, 01:57

One alloy is 2 parts iron to 3 parts silver and another alloy is 7 parts iron to 3 parts silver. How much of each should be combined to produce a 30 pound alloy that is 1 part iron to 1 part silver?

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  1. 15 May, 05:34
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    Let x be your first alloy

    2/5x+7/10 (30-x) = 1/2 (30)

    4x+210-7x=150

    3x=60

    x=20

    So, you need 20 lbs of the first alloy, and 10 parts of the second to make 30 lbs of half iron and half silver alloy!
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